Including these header fields allows the UAC to determine the features and extensions supported by the UAS for the duration of the call, without probing. Looped requests are errors, and the procedures for detecting them and handling them are described by the protocol. If none is found, the element MUST process the response even if it is an informational response as a stateless proxy described below. The proxy core determines where to route the request, choosing one or more next-hop locations. Note, however, that the INVITE server transaction will be destroyed as soon as it receives this final response and passes it to the transport. This SDP message not shown in the Rosenberg, et.

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In this case, the OK is routed back through the two proxies and is received by Alice’s softphone, which then stops the ringback tone and indicates that the call has been answered. SIP runs on top of several different transport protocols. Both request and response messages include the version of SIP in use, and follow [H3. It enumerates all the extensions understood by the UAC. A caller retains this role from the time it sends the initial INVITE that established a dialog until the termination of that dialog. Display names are described in RFC [3].

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This location service is effectively a database containing mappings between a single URI and a set of one or more alternative locations at which the target sceipt that URI can be found. These UASs will frequently need to query the user about whether to accept the Rosenberg, et. This is the mechanism through which a proxy routes a request toward its destination.

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Otherwise, this approach MAY be used, but the Route insertion mechanism above is preferred for its robustness, flexibility, generality and consistency of operation. In all of these cases, it formulates a response using the procedures described in Section 8.

A header Rosenberg, et. The presence of additional Via header field values that precede the originator of the request suggests that the message was misrouted or possibly corrupted. Des petits lOgiciels gratOs sont aussi à télécharger pour améliorer tOn Ordi!


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This typical arrangement is often referred to as the « SIP trapezoid » as shown by the confactsay shape of the dotted lines in Figure 1. Design by lequipe-skyrock Choisir cet habillage.

Requests forwarded between different types of transports where the proxy’s TU must take an active role in ensuring reliable delivery on one of the transports MUST be forwarded transaction statefully. However, since CANCEL requests are hop-by-hop and cannot be resubmitted, they cannot be challenged by the conhactsay in order to get proper credentials in an Authorization header field.

RFC – SIP: Session Initiation Protocol –

The implementation of these applications is complicated by the practices of participants: This may be useful when messages would otherwise become too large to be carried on the transport available to it exceeding the maximum transmission unit MTU when using UDP, for example. Each message is labeled with the letter « F » scri;t a number for reference by the text.

Registration on behalf of a particular address-of-record can be performed by a cintactsay authorized third party. It is possible for the CSeq sequence number to be higher than the remote sequence number by more than one.

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Ranger les posts par: While this specification suggests specific wording for the reason phrase, implementations MAY choose other text, for example, in the language indicated in the Accept-Language header field of the request.

The majority of response processing in the TU is method specific. If the From tag, Call-ID, and CSeq exactly match those associated with an ongoing transaction, but the request does not match that transaction based on the matching rules in Section Typically, this means that the request’s Request-URI differs from its previous arrival.

Session Initiation Protocol June enabling Internet endpoints called user agents to discover one another and to agree on a characterization of a session they would like to share.


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Frequently, the user will not enter a complete URI, but rather a string of digits or letters for example, « bob ». A call is an informal term that refers to some communication between peers, generally set scropt for the purposes of a multimedia conversation.

Si vous n’avez pas de compte sur Bizpowa il faut vous enregistrer sinon vous ne pourrez pas poster ni lire les posts. An Allow header field Section As discussed in Section For each tuple attempted, the proxy MUST format the message as appropriate for the tuple and send the request using a new client transaction as detailed in steps 8 through This supports stateless session processing in various elements, and supports failover and recovery capabilities.

However, these requests do not cause the dialog’s route set to be modified, although they may modify the remote target URI.

As a result, although DNS and location service lookups were required to route the initial INVITE, the Ringing response can be returned to the caller without lookups or without state being Rosenberg, et. A logical entity that does not maintain the client or server transaction state machines defined in this specification when it processes requests.

A typical cause for this is call forwarding. For instance, a proxy MAY forward a request from one TCP connection to another transaction statelessly as long as it places enough information in the message to be able to forward the response down the same connection the request arrived on.

This set of proxies is represented by a set of URIs each of which contains the lr parameter.